The Firebird licenses

Firebird is a free, open-source database management system, but “free” does
not mean that everything is permitted. The use of Firebird is governed by two licenses: the IPL
(InterBase Public License) and the IDPL (Initial Developer's Public License). The first one
covers the parts of the source code that were inherited from InterBase; the second applies to
the additions and improvements made by the Firebird Project. Both licenses offer similar rights
and restrictions. In short:

Use of the software is free, even for commercial purposes. You may also redistribute
the software, separately or with a product of your own, but you may not claim ownership or
credit for it. Any license notices included with Firebird must remain intact.

You may modify and recompile the Firebird source code or parts of it. You may
distribute such modified versions, but if you do so, you must document
your modifications and make them publicly available, at no cost, under the same license as
the original code.

You may include Firebird source code (modified or not) in a larger work and distribute
that larger work, in source and/or compiled form, under a license of your own choosing. You
need not publicize the source code for the entire larger work, but you
must fulfill the license conditions for the parts that were taken from
Firebird, whether they were modified or not.

Please notice that the above is a simplified overview. Only the original license texts are
legally binding. You can find them here: